Peavey CS 800X User manual

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1

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C

S

®

8

O

O

X

PROFESSIONAL

STEREO

POWER

AMPLIFIER

OPERATING

GUIDE

-

r

-

-

'0

I

OOT»

•ELv

S0i9fn^

:rNU.SA

The

world

famous

CS®

800

power

amplifier

has

now

been

changed

to

the

new

CS®

800X

with

new

extended

performance,

providing

impressive

new

two

ohm

output

power

capability

while

still

maintaining

the

current

4

and

8

ohm

ratings

and

awesome

industry

standards

for

power

bandwidth,

slew

rate,

and

distortion

specifications.

Following

is

the

new

extended

specs:

420

W

RMS

into

4

ohms...600

W

RMS

into

2

ohms

(per

channel)

840

W

RMS

into

8

ohms...

1200

W

RMS

into

4

ohms

(bridged)

DDTTM

compression

with

LED

indicators

and

defeat

switch

Slew'

Rate:

40

V/microsecond.

stereo

mode,

each

channel

Power

Bandwidth:

10

Hz

to

50

KHz

@

4

ohms,

rated

power

Total

Harmonic

Distortion:

Less

than

0.03%,

rated

power

Hum

and

Noise:

100

dB

below

rated

powder,

unweighted

All

the

current

features

of

the

old

units

have

been

retained,

including

Peavey's

patented

DDT

"

(Distortion

Detection

Technique)

Compression

Circuitry,

and

the

very

flexible

back

panel

patching

capabilities.

The

two

speed

fan

cooling

system

has

been

improved

to

provide

addi¬

tional

cooling,

when

needed,

for

the

tw'o

ohm

load

conditions.

FEATURES

•

Automatic

two-speed

fan

cooling

system/tunnel

•

Independent

channel

thermal/fault

protection

•

Transient

free

turn-on/off

operation

(relay)

•

One

recessed

crossover

“island”

socket

for

plug-in

modules

•

Two

recessed

balanced

input

transformer

sockets

for

PL-2’s

•

Single

XLR

&

dual

phone

plug

inputs

each

channel

•

Phone

plug

inputs

are

QUASI-ELECTRONIC

BALANCED

•

XLR

input

can

be

QUASI-ELECTRONIC

BALANCED

(push

switch

out)

•

XLR

input

can

be

transformer

balanced

(push

switch

in)

•

Dual

phone

plug

and

5

way

binding

post

outputs

each

channel

•

DDT

activation

LED

&

power

LED

each

channel

•

Calibrated/detented

input

attenuator

control

each

channel

•

Rear

panel

DDT

defeat

&

bridge

mode

select

slide

switches

WARNING!

For

uptiinum

performance

and

reliability

DO

NOT

PRF.SRNTTHE

AMPLIFIER

WITH

A

SPEAKER

LOAD

OF

LESS

THAN

2

OHMS,

OR

A

COMBINATION

OF

SPEAKERS

THAT

TOGETHER

ARE

LESS

THAN

2

OHMS!

Lising

one

speaker,

it

must

be

rated

at

2

ohms

minimum.

Using

two

speaker,

they

must

be

rated

each

at

4

ohms

minimum.

Using

three

speaker,

they

must

be

rated

each

at

8

ohms

minimum.

DDTT^’

ACTIVE

LED

(1)

Illuminates

when

DDT

Compression

is

taking

place.

With

the

ENABLE/DEFEAT

switch

in

the

DEFEAT

position,

the

LED

indicates

when

clipping

distortion

is

occurring.

POWER

LED

(2)

Illuminates

when

AC

power

is

being

supplied

to

the

amp,

and

the

associated

channel

is

opera¬

tional.

Illumination

is

delayed

slightly

during

the

power-up

cycle

due

to

the

transient

suppres-

sion/lhermal

fault

circuitry.

If

either

channel

were

to

experience

fault

conditions

or

to

exceed

the

safe

operating

temperature

limits,

then

that

channel

will

shut

down,

and

the

associated

power

LED

will

go

out,

indicating

such

conditions

exist.

Also,

whenever

the

BRIDGE

mode

is

selected,

the

power

LED

on

channel

B

is

defeated

(OFF),

just

as

if

there

were

a

fault

condi¬

tion

on

channel

B.

This

provides

a

positive

indication

that

the

CS-800X

is

in

bridge

mode.

INPUT

SENSITIVITY

(3)

Maximum

input

gain

(minimum

sensitivity

rating)

is

achieved

at

the

full

clockwise

setting.

This

setting

yields

maximum

mixer/system

headroom.

A

setting

of

less

than

one

full

clockwise

turn

will

yield

lower

system

noise

at

the

expense

of

mixer/system

headroom.

Calibration

indicates

sensitivity

in

dB

V

necessary

to

attain

the

full

available

output

power

rating.

POWER

SWITCH

(4)

Depress

to

“On”

position

to

turn

on.

CHANNELA

HIGH

Z

INPUT

JACKS

(5)

Two

parallel

(bridged)

input

jacks

are

provided.

This

allows

for

one

to

be

used

as

a

conven¬

tional

input,

and

the

other

to

be

used

simultaneously

as

a

“line

out”

to

connect

to

another

input

jack

on

this

amplifier

or

other

amps/equipment.

These

1/4”

jacks

are

not

“chassis

grounded”

and

when

used

will

provided

a

QUASI-BALANCED

input

capability

due

to

a

unique

“

ground

loop”

elimination

circuitry

associated

with

the

input.

This

feature

will

nor¬

mally

allow

“hum

free”

operation

when

relatively

short

1/4”

cable

patches

are

made

between

the

various

jacks

on

this

amp

and

other

jacks

on

equipment

that

share

the

same

rack

with

this

amp.

This

QUASI-BALANCED

capability

is

automatic,

and

it

can

not

be

re¬

moved

from

the

system's

circuitry.

LOW

Z

INPUT

(6)

A

conventional

three-pin

female

XLR

input

jack

is

provided

and

may

be

used

as

the

channel

A

input.

When

the

(PL-2)

line

balancing

transformer

is

not

used,

this

XLR

input

becomes

QUASI-BALANCED

with

pin

#3

as

the

positive

input

(connecting

to

the

tip

of

the

1/4"

input

jacks

above),

pin

#2

as

the

negative

input

(connecting

to

the

floating

sleeve

of

the

1/4"

input

jacks

above),

and

pin

#1

going

to

chassis

ground.

When

the

(PL-2)

line-balancing

transformer

is

used,

this

XLR

input

becomes

fully

TRANSFORMER-BALANCED

(Pin

#3

positive,

pin

#2

negative,

pin

#1

ground).

(See

the

PL-2

SELECTOR

SWITCH

section

for

details

on

related

settings)

PL-2

SELECTOR

SWITCH

(7)

This

switch

is

to

be

used

in

conjunction

with

the

PL-2

transformer

to

allow

the

LOW

Z

INPUT

to

function

with

or

without

a

PL-2

module

being

inserted

in

the

receptacle.

A

similar

function

was

performed

by

using

a

PL-1

module

inserted

in

the

PL-2

receptacle

on

older

amplifier

models.

The

“OUT”

position

of

this

switch

selects

the

QUASI-BALANCED

mode

of

opera¬

tion

for

the

LOW

Z

INPUT

(XLR

jack),

and

routes

the

input

signal

directly

to

the

HI

Z

INPUT

JACKS.

In

this

position

the

HI

Z

INPUT

JACKS

may

be

used

as

outputs

after

the

LOW

Z

INPUT

to

allow

patching

this

signal

to

another

input

on

this

amp.

Normally,

in

this

switch

position,

a

(PL-2)

transformer

is

not

present

(“OUT”)

in

the

transformer

receptacle;

however,

if

one

were

“IN”

the

receptacle,

the

LOW

Z

INPUT

would

still

be

QUASI-BALANCED.

It

becomes

TRANSFORMER

BALANCED

only

when

the

IN

switch

position

is

selected.

Notice

this

is

a

very

effective

means

to

“test”

for

the

necessity

of

a

line-balancing

transformer.

The

“IN”

position

of

the

switch

routes

the

input

signals

from

the

XLR

jack,

through

the

(PL-2)

line¬

balancing

transformer,

thus

selecting

the

TRANSFORMER

BALANCED

mode

of

operation

for

the

LOW

Z

INPUT.

In

this

position

the

HI

Z

INPUT

JACKS

may

be

used

as

outputs

after

the

line

balancing

transformer

to

patch

the

signal

to

another

input

jack

on

this

amplifier

or

other

amps/equipment.

If

the

“IN”

position

is

selected

without

a

(PL-2)

line-balancing

transformer

“IN”

the

receptacle,

the

LOW

Z

INPUT

will

be

rendered

inoperable.

TRANSFORMER

RECEPTACLE

(8)

This

receptacle

only

receives

the

optional

(PL-2)

line-balancing

transformer.

When

conditions

exist

that

demand

the

usage

of

a

TRANSFORMER-BALANCED

XLR

CONNECTOR

at

the

tions

exist

that

demand

the

usage

of

a

TRANSFORMER-BALANCED

XLR

CONNECTOR

at

the

input

of

channel

“A”,

the

(PL-2)

transformer

must

be

put

here,

the

selector

switch

must

be

in

the

“IN”

position.

SPEAKER

OUTPUTS

(9)

Two

1/4"

jacks

and

5

way

binding

post

speaker

output

terminals

are

provided.

All

these

outputs

are

in

parallel,

hence

the

speaker

connection

cables

can

be

terminated

with

1/4"

phone

plugs,

banana

plugs,

or

stripped

wires

for

use

in

the

binding

post

terminals.

For

sustained

high

power

applications,

the

use

of

the

binding

post

terminals

are

recommended;

however,

care

must

be

exercised

to

assure

correct

speaker

phasing.

Regardless

of

what

connections

are

used,

the

typical

parallel

speaker

load

should

always

be

limited

to

2

ohms

per

channel

or

4

ohms

BRIDGE

mode

for

any

application.

Operation

at

loads

of

4

ohms

per

channel

or

8

ohms

BRIDGE

mode

is

more

desirable

for

sustained

operation

applications

due

to

the

fact

that

the

amplifier

will

run

much

cooler

at

this

load.

Operation

above

4

ohms

per

channel,

and

even

open

circuit

conditions,

can

always

be

considered

safe;

however,

sustained

operation

at

loads

below

2

ohms

could

result

in

temporary

amplifier

shut

down

due

to

the

thermal

limits

and/or

the

internal

fault

circuitry.

When

used

in

BRIDGE

mode

the

positive

speaker

lead

should

be

connected

to

Channel

A

RED

BINDING

POST

and

the

negative

speaker

lead

to

Channel

B

RED

BINDING

POST.

CHANNELB

NOTE:

On

this

channel

a

crossover

module

“ISLAND”

has

been

provided

to

allow

a

PL-MODULE

ELECTRONIC

CROSSOVER

to

be

used

to

perform

a

“BIAMP”

function.

Associated

with

this

island

are

dual

crossover

input

jacks,

high

and

low

output

jacks,

and

a

crossover

receptacle.

These

will

be

discussed

further

in

following

sections,

but

please

note

that

the

channel

B

patches

are

somewhat

different

from

those

of

channel

A.

HIGH

Z

INPUT

JACKS

(10)

Two

parallel

input

jacks

are

also

provided

in

this

channel,

allowing

the

flexibility

of

the

Y-

cord

capability

here

as

well.

These

jacks

are

also

not

chassis

grounded

and

will

provide

a

QUASI-BALANCED

input

capability.

Both

of

these

input

jacks

are

“switching”

type,

where

usage

of

either

of

these

jacks

disables

the

signal

feed

from

the

LOW

Z

INPUT

circuitry

associated

with

this

channel.

This

is

necessary

to

allow

this

input

to

be

patched

from

the

appropriate

electronic

crossover

output

jack

and

then

use

the

LOW

Z

INPUT

circuitry

as

the

input

for

the

electronic

crossover.

This

feature

prevents

these

jacks

from

being

used

as

outputs

from

the

LOW

Z

INPUT

circuitry,

as

was

possible

with

the

Channel

A

input

jacks.

LOWZINPUT(ll)

A

conventional

three-pin,

female

XLR

input

jack

is

also

provided

here,

and

it

can

be

used

as

the

channel

B

input,

provided

the

HI

Z

INPUT

jacks

are

not

being

used.

When

the

(PL-2)

line-balancing

transformer

is

not

used,

this

XLR

input

becomes

QUASI-BALANCED

with

the

exact

same

pinout

arrangements

as

discussed

for

channel

A.

When

the

(PL-2)

line

balanc¬

ing

transformer

is

used,

this

XLR

input

becomes

fully

TRANSFORMER-BALANCED,

again

with

the

same

pin

polarities

as

those

presented

for

channel

A.

(See

the

PL-2

SELEC¬

TOR

SWITCH

manual

section

for

details

on

related

settings).

The

output

of

this

low

Z

circuitry

is

always

connected

to

the

CROSSOVER

INPUTS

and

thus

this

low

Z

feature

can

be

used

as

the

input

for

the

crossover

module

if

the

application

demands

the

use

of

an

XLR

connector.

PL-2

SELECTOR

SWITCH(12)

The

function

of

this

switch

is

identical

to

that

of

channel

A

function.

The

“OUT”

position

of

this

switch

selects

the

QUASI-BALANCED

mode

of

operation

for

the

LOW

Z

INPUT

(XLR

jack)

and

routes

this

input

signal

directly

to

the

HI

Z

INPUT

jacks

if

these

Jacks

are

not

in

use.

Since

this

signal

is

also

routed

to

the

CROSSOVER

INPUT

jacks,

now

these

jacks

may

be

used

as

outputs

after

the

LOW

Z

INPUT

to

allow

patching

this

signal

to

another

input

on

this

amplifier.

Similarly,

the

“IN”

position

of

the

switch

routes

the

input

signals

from

the

XLR

jack

through

the

(PL-2)

line-balancing

transformer

thus

selecting

the

TRANSFORMER-BALANCED

mode

of

operation

for

the

LOW

Z

INPUT.

In

this

position

the

CROSSOVER

INPUTS

may

be

used

as

outputs

after

the

line-balancing

transformer

to

patch

the

signal

to

another

input

jack

on

this

amplifier

or

other

amps/equipmenl.

Again

selecting

the

“IN”

position

without

a

(PL-2)

line-balancing

transformer

IN

the

receptacle

will

render

the

LOW

Z

INPUT

inoper¬

able,

and

this

switch

can

be

used

to

test

the

“effectiveness”

of

TRANSFORMER

BALANC¬

ING.

TRANSFORMER

RECEPTACLE(13)

This

receptacle

only

receives

the

optional

(PL-2)

line-balancing

transformer.

When

condi¬

tions

exist

that

demand

the

usage

of

a

TRANSFORMER-BALANCED

XLR

INPUT

at

the

input

of

channel

“B”,

or

at

the

input

of

the

PL-MODULE

ELECTRONIC

CROSSOVER

when

BIAMPING

then

the

(PL-2)

transformer

must

be

put

here,

and

the

selector

switch

must

be

in

the

“IN”

position.

CROSSOVER

INPUTS

(14)

These

are

the

HI

Z

INPUTS

for

the

ELECTRONIC

CROSSOVER

when

installed.

Two

parallel

input

jacks

are

again

provided

at

this

point,

allowing

the

flexibility

of

line

out

capa¬

bility

here

as

well.

These

jacks

are

also

not

chassis

grounded

and

will

provide

a

QUASI-

BALANCED

input

capability

to

minimize

potential

groundloops.

Again,

this

feature

is

automatic.

As

mentioned,

the

output

of

the

low

Z

input

circuitry

of

channel

B

is

always

connected

to

these

inputs,

which

allow

the

LOW

Z

INPUT

to

be

used

as

the

ELECTRONIC

CROSSOVER

input

if

desired.

These

inputs

then

can

be

used

as

the

FULL

RANGE

outputs

allowing

additional

patching

capability.

CAUTION:

When

a

full

range

signal

is

patched

into

either

the

XLR

input

or

the

crossover

inputs

on

channel

B

to

feed

the

crossover

module

itself

this

full

range

signal

is

also

routed

to

the

channel

B

input.

The

final

patching

from

the

crossover

output

to

the

channel

B

input

■

d

i

s

c

onnects

this

full

range

signal

feed

to

the

channel

B

input

and

instead

is

patched

to

the

appropriate

crossed-over

signal.

This

occurs

because

the

channel

B

input

jacks

are

switching

type.

If

you

were

to

inadvertently

disconnect

the

cable

which

is

routing

the

crossed-over

signal

to

the

channel

B

input,

the

switching

arrangement

will

feed

a

full

range

signal

to

that

channel

and

could

possibly

destroy

the

transducer

that

is

connected

to

this

channel

output.

ALWAYS

REDUCE

LEVELS

BEFORE

ATTEMPTING

TO

MAKE

ANY

PATCHING

CHANGES.

CROSSOVER

MODULE

RECEPTACLE

(15)

This

receptacle

only

receives

a

PL-MODULE

ELECTRONIC

CROSSOVER.

The

PL-

MODULES

are

optional

accessories

and

are

available

in

many

different

crossover

frequen¬

cies.

Some

modules

contain

special

equalization

and

special

padding

for

a

particular

Peavey

speaker

enclosure.

Always

be

sure

to

select

the

correct

module

for

your

speaker

system.

Other

special

purpose

modules

are

also

available

for

usage

in

this

receptacle.

As

such

this

receptacle

supplies

both

the

input

and

output

patch

facilities

and

the

power

supply

"feeds"

for

these

active

electronic

devices.

CROSSOVER

LOW

OUTPUT

(16)

This

jack

supplies

the

crossed-over

low

frequency

output

from

the

installed

PL-MODULE

ELECTRONIC

CROSSOVER.

This

output

must

be

patched

to

the

appropriate

power

amp

input

jack

to

“create”

an

operational

biamp

system.

On

some

special

purpose

modules,

this

output

jack

is

not

used.

CROSSOVER

HIGH

OUTPUT

(17)

This

jack

supplies

the

crossed-over

high

frequency

output

from

the

installed

PL-MODULE

ELECTRONIC

CROSSOVER.

This

output

must

also

be

patched

to

the

appropriate

power

amp

input

jack

to

create

an

operational

biamp

system.

SPEAKER

OUTPUTS

(18)

Same

function

and

comments

as

channel

A.

MODE

SWITCH

(19)

This

switch

is

used

to

select

either

STEREO

or

BRIDGE

mode

of

operation.

DDT

SWITCH

(20)

This

switch

is

used

to

either

ENABLE

or

DEFEAT

the

DDT

compressor.

CIRCUIT

BREAKER

(21)

The

CS-800X

now

uses

a

circuit

breaker

in

place

of

the

main

fuse.

This

breaker

is

provided

to

limit

the

current

to

the

associated

power

transformer

and

thereby

protect

it

from

overheat¬

ing

and

possible

destruction

due

to

fault

conditions

in

the

amplifier.

The

trip

current

value

has

been

carefully

chosen

to

allow

continuous

power

output

performance

while

still

provid¬

ing

adequate

protection

for

the

power

transformer.

Normally

this

breaker

should

not

trip

unless

there

is

a

fault

in

the

amplifier

circuitry

that

draws

excessive

mains

current.

However,

abnormal

conditions

such

as

a

short

circuit

on

either

or

both

channels

or

continuous

operation

at

overload

or

clipping,

especially

into

2

ohm,

load

will

cause

the

breaker

to

trip.

If

this

occurs

simply

reset

the

breaker

and

correct

the

cause

of

the

overload.

When

tripped,

the

button

on

the

breaker

will

be

outward

nearly

1/2",

and

can

be

reset

by

pushing

inward.

A

normal

reset

button

length

is

about

1/4”.

If

this

“thermal”

type

breaker

does

trip,

then

simply

pushing

the

button

back

in

will

reset

it

after

waiting

a

brief

period

of

time

to

allow

it

to

cool

down.

If

the

breaker

trips

instantly

each

time

you

attempt

to

reset

it,

then

the

unit

should

be

taken

to

a

qualified

service

center

for

repair.

MAINS

POWER

SOURCE

(120

V

Products

Only)

(22)

The

CS-800X

is

fitted

with

a

single

heavy

duty

#14

AWG

3

conductor

line

cord

and

a

conventional

AC

plug

with

a

ground

pin.

It

should

be

connected

to

an

independent

mains

circuit

capable

of

supporting

at

least

15

AMPS

continuously

or

greater.

This

is

particularly

critical

for

sustained

high

power

applications.

If

the

socket

used

does

not

have

a

ground

pin,

a

suitable

ground

lift

adaptor

should

be

used

and

the

third

wire

grounded

properly.

Never

break

off

the

ground

pin

on

the

CS-800X.

The

use

of

extension

cords

should

be

avoided,

but

if

necessary,

always

use

a

three-wire

type

with

at

least

a

#14

AWG

wire

size.

The

use

of

lighter

wire

will

severely

limit

the

power

capability

of

this

amplifier.

Always

use

a

qualified

electrician

to

install

any

necessary

electrical

equipment.

To

prevent

the

risk

of

shock

or

fire

hazard,

always

be

sure

that

the

amplifier

is

properly

grounded.

INSTALLATION

AND

CONNECTION:

The

Peavey

CS-800X

commercial

series

power

amplifier

is

designed

for

durability

in

com¬

mercial

installations

and

the

quality

of

performance

required

in

studio

and

home

applications.

The

unit

is

a

standard

rack-mount

configuration,

5

1/4"

high,

and

is

cooled

by

an

automatic

two-speed

internal

fan.

All

the

input

and

output

connections

are

on

the

back

panel.

The

front

panel

contains

LED

indicators

for

power

and

DDT

activation,

detented/calibrated

sensitivity

controls,

and

a

mains

power

switch.

INDUSTRIAL

AND

COMMERCIAL

INSTALLATIONS

For

commercial

and

other

installations,

where

sustained

high

power

operation

is

required,

the

CS-800X

should

be

mounted

in

a

standard

19"

rack.

It

is

not

necessary

to

leave

rack

space

between

each

amplifier

in

the

stack,

since

the

fan

pulls

air

in

from

the

rear

and

exhausts

the

hot

air

out

the

front.

An

adequate

“COOL”

air

supply

must

be

provided

for

the

amplifier

when

rack-mounted.

The

internal

fan

must

have

a

source

of

air

that

is

not

preheated

by

other

equipment.

The

amplifier

will

start

up

in

“LOW

SPEED”

fan

operation

and

will

normally

stay

at

low

speed

operation

unless

sustained

high

power

operating

levels

occur.

Then,

as

the

amplifier

“HEAT

SINKS”

heat

up,

the

automatic

thermal

sensing

circuitry

will

cause

high

speed

operation

to

occur.

Depending

upon

signal

conditions

and

amp

loading,

high

speed

fan

operation

may

continue,

or

it

may

cycle

continuously

between

high

and

low.

This

situation

is

quite

normal.

If

cooling

is

inadequate

due

to

preheated

air,

or

a

reduction

of

air

flow^

occurs

due

to

blockage

of

the

amplifier

inlet/outlet

ports,

or

if

the

amplifier

is

severely

overloaded

or

short

circuited,

then

the

amplifier

thermal

sensing

system

may

cause

temporary

shutdown

of

that

particular

channel.

This

is

indicated

by

the

channel

power

LED

(on

the

front

panel)

ceasing

to

illuminate.

Depending

upon

available

cooling

air,

operation

should

be

restored

in

that

channel

relatively

quickly,

and

the

power

LED

will

be

illuminated.

In

any

event,

correc¬

tive

action

should

be

taken

to

determine

the

cause

of

the

thermal

shutdown.

If

the

amplifier

is

not

severely

overloaded

or

shorted

and

air

flow

is

normal

in

and

out

of

the

unit,

steps

should

be

taken

to

provide

a

cooler

environment

for

all

the

amplifiers.

As

a

general

rule,

the

cooler

electronic

equipment

is

operated,

the

longer

its

useful

service

life.

STUDIO

AND

HOME

INSTALLATION:

In

most

low

to

medium

power

applications,

the

CS-800X

can

be

mounted

in

any

configura¬

tion.

It

is

desirable,

if

at

all

possible,

that

the

unit

be

located

at

the

top

of

an

equipment

stack.

This

will

prevent

possible

overheating

of

any

sensitive

equipment

by

the

hot

air

rising

from

the

power

amplifier.

As

a

general

rule,

most

home

and

studio

requirements

will

never

cause

high

speed

fan

operation.

If

it

does

however,

this

may

indicate

that

you

have

not

taken

the

necessary

steps

to

provide

adequate

cooling.

Remember,

closed

up

in

a

cabinet,

the

CS-800X

will

have

severe

cooling

problems,

even

at

low

power

levels.

Again,

inadvertent

short

circuit

or

sustained

overloaded

usage

could

also

cause

temporary

thermal

shutdown.

Also,

most

home

wiring

and

electrical

circuits

are

only

15

AMPS.

Two

CS-800X’s

could

cause

a

power

panel

15

AMP

circuit

breaker

to

trip

if

a

severe

overload

occurs.

BRIDGE

MODE:

The

bridge

mode

on

stereo

amplifiers

is

often

misunderstood

as

to

the

actual

operation

and

usage.

In

basic

terms,

when

a

two

channel

amplifier

is

operated

in

the

BRIDGE

mode,

it

is

converted

into

a

single

channel

unit

with

a

POWER

RATING

equal

to

the

sum

of

both

channels'

power

ratings,

at

a

LOAD

RATING

of

twice

that

of

the

single

channel

rating.

In

this

case,

the

CS-800X

is

rated

at

600

watts

RMS

per

channel

into

2

ohms.

The

BRIDGE

RATINGS

is

1200

watts

RMS

into

4

Ohms

(minimum

load).

Bridge

mode

operation

is

accomplished

by

placing

the

mode

switch

in

the

“BRIDGE”

position,

connecting

the

positive

speaker

lead

to

Channel

A

RED

binding

post,

negative

speaker

lead

to

Channel

B

RED

binding

post,

and

using

channel

A

as

the

input

channel.

All

channel

B

input

functions

are

defeated.

Another

application

for

BRIDGE

mode

operation

is

to

drive

sound

distribution

systems

in

very

large

public

address

applications.

In

this

mode,

the

CS-800X

power

amplifier

can

actually

drive

70

volt

systems

directly

without

using

expensive

matching

transformers.

The

real

advantage

of

such

an

approach

is

primarily

cost.

70

volt

distribution

systems

are

very

common

in

domestic

applications

where

large

numbers

of

relatively

small

loudspeakers

are

used

for

BACKGROUND

MUSIC

AND

PAGING.

Such

systems

require

the

use

of

70

volt

TRANSFORMERS

at

each

loudspeaker.

Another

common

use

for

the

BRIDGE

mode

is

in

SUBERWOOFER

applications

where

very

high

power

levels

are

required

to

reproduce

extreme

low

frequencies.

Such

enclosures

usually

contain

2

or

4

loudspeakers

to

handle

the

power

levels

involved.

For

bridge

mode

usage,

the

enclosure

impedance

must

be

4

or

8

ohms;

never

below

4

ohms!

Also

make

sure

the

enclosure

can

handle

1200

watts

reliably.

DDT:

Peavey’s

patented

DDT

compression

circuitry

enables

the

sound

man

to

maximize

the

performance

of

the

amplifier/speaker

combination

by

preventing

the

power

amp

from

run¬

ning

out

of

headroom

.

This

compression

system

is

activated

by

a

very

unique

circuit

that

senses

signal

conditions

that

might

overload

the

amplifier

and

activates

compression

(reduces

the

amp

gain)

when

clipping

is

imminent.

Threshold

of

compression

is

then

clipping

itself,

and

no

specific

threshold

control

is

used.

This

technique

effectively

utilizes

every

precious

watt

available

for

the

power

amplifier

to

reproduce

the

signal,

while

at

the

same

time

mini¬

mizes

clipping

and

distortion,

and

thus

significantly

reduces

the

potential

of

loudspeaker

degradation

and

damage.

The

DDT

system

is

an

automatic,

hands-off

approach

to

the

problem

of

power

amplifier

clipping.

Since

the

CS-800X

power

amplifier

now

uses

a

circuit

breaker

for

over-current

protection,

the

DDT

compression

system

plays

an

even

more

impor¬

tant

roll

in

continuous

performance

by

preventing

each

channel

from

clipping

and

overload.

Continuous

operation

at

clipping

can

cause

the

circuit

breaker

to

trip,

but

with

the

DDT

activated,

this

problem

is

minimized.

For

this

reason,

you

should

always

have

the

DDT